This calculator estimates the indicative investment, yearly savings, payback period and 10-year profit for Dutch households. It uses six core inputs: electricity price, always-on baseload, total panel wattage, battery capacity, P1 meter and a dynamic energy contract.
Adjust the inputs and immediately compare what extra storage, a P1 meter and more solar wattage do to your business case.
Adjust the inputs and see what your battery scenario does immediately.
The page is intentionally transparent so both users and AI systems can follow and cite the logic.
We first estimate how much solar power your household can consume instantly during the day. That is capped by your continuous load and by a maximum direct output of 0.8 kW to the home.
Next we calculate the daily surplus. That surplus can only be stored up to the chosen battery capacity.
The battery later feeds stored energy back into the home. We cap that part at your continuous load as well to keep the estimate conservative.
Finally we combine hardware cost, optional P1 meter, dynamic-tariff trading upside and yearly savings into a payback period and 10-year profit view.
| Parameter | Waarde | Waarom dit telt |
|---|---|---|
| Effective sun hours | 3.2 hours per day | Multiplier used for daily panel generation. |
| System efficiency | 90% | Loss correction for conversion and real-world use. |
| Daylight window | 12 hours per day | Period used to compare baseload against generation. |
| Maximum direct output | 0.8 kW | Software-limited direct delivery to the home. |
| Base system price | €350 | Indicative starting price for an 800Wp setup without a battery. |
| Extra cost per +400Wp | €150 | Added on top of the 800Wp baseline configuration. |
| P1 meter | €29.90 | Optional add-on for better zero-export control. |
| Dynamic tariff trading margin | €0.18 per kWh of storage per day | Indicative extra upside from smart charge and discharge. |
| Invoer | Effect op de berekening | Vooral relevant voor |
|---|---|---|
| Electricity price | A higher tariff increases the yearly value of every self-consumed kWh. | Homes with expensive evening electricity or high retail tariffs. |
| Baseload | More continuous usage means more direct solar self-consumption during the day. | Homes with routers, ventilation, NAS devices or always-on appliances. |
| Panel wattage | More panel power lifts generation, but direct output to the home stays capped. | Users who want more surplus available for charging the battery. |
| Battery capacity | More storage shifts more excess solar into the evening, but also raises the investment. | Homes with strong evening demand or larger roofs. |
| P1 meter | Reduces unnecessary export and improves zero-export accuracy. | Anyone trying to limit export-related costs. |
| Dynamic tariff | Adds a trading component on top of normal self-consumption savings. | Users who automate charging and discharging around hourly price spreads. |
See which capacity, chemistry and warranty level fit your home.
Open buying guide arrow_forward menu_bookUnderstand when smart charging makes the financial case stronger.
Read tariff guide arrow_forward menu_bookReview what a plug-and-play or socket battery setup should account for.
View installation guide arrow_forwardIt estimates four main outcomes: total investment, yearly savings, payback period and 10-year profit. To do that, it combines electricity price, baseload, panel wattage, battery capacity, a P1 meter and a dynamic tariff into one transparent model.
The higher your continuous daytime demand, the more solar power you can use instantly. That raises yearly savings and reduces how much energy is unnecessarily exported to the grid.
A P1 meter helps when you want to reduce export or make your battery respond more accurately to real-time household demand. In this calculator it remains a separate toggle so you can see its impact clearly.
Not always, but it often helps when the system can charge during low-price hours and discharge during peaks. That is why the calculator adds a separate indicative trading margin when the option is enabled.
They are directional. The calculator is built as a fast 2026 business-case tool using fixed assumptions for sun hours, efficiency, hardware costs and daily consumption patterns.